Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bacc8b1147f79a…

MALICIOUS

PDF

89.6 KB Created: 2021-09-01 06:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2df0d428491e8c02959be7b0cf8de28a SHA-1: 13b33b056b50423e2aa30805538b3dddb44dee13 SHA-256: 76bacc8b1147f79a8bd90202299dcd34a73a6fc3e288e817cee0de4b2cae76e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a63714f23aa6df4a02d3a7c0cc605078/26546780951.pdf In PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/p2n42gqprvupg5ijhd5kpd1p07/15652452180.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/gilapumovuwaxib.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/vurakewubogifa.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6c35538205fd38f4d7f19559296c091b/45544273342.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210528160359082.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/13e056fc35f55f37c37e0e21948b428c/wowodam.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/59934393017.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070f5f13be97---lowosobekexiviwoxa.pdfIn PDF document text
    • https://esz.jp/img/editor/files/vepomo.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/falorolowasavakoxot.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/89683004414.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/togasaketagaxune.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/9549200226.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/mugaxe.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bd5ecfa79---wamelofinojuduvaxoz.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/76c295fqt68fua4p0vdsabi14s/wazogujitika.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/pedejuzikas.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/56343395318.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/dolilepitom.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/mojutibovewodemexo.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6228a0e361a898fdbc6f0ebdb384a22c/74499790096.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/xomij.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/wepow.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/85239148856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=use+characterization+in+a+sentencePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001116b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116B 18012 bytes
SHA-256: cd39475738042dfb677582d2827212c159f117bc2b085ca570c4d38d1754959d
font_02_sfnt_off00014031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14031 10348 bytes
SHA-256: b5c3c79ba184f4d934e34a8555413ac90772849e49d757520bd15aca0ffb68a8

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